I progress! I have the desired result.
However I have an error 1429.
I do not understand this error.

crxDbField = THIS.crreport.DATABASE.TABLES.ITEM( 1 ).FIELDS.ITEM( 64 )
THIS.crreport.areas.ITEM("GH1").groupConditionField = crxDbField
THIS.crreport.areas.ITEM("GH1").DiscardOtherGroups = .T.
THIS.crreport.areas.ITEM("GH1").SortDirection = 1

THIS.crreport.areas.ITEM("GH1").SpecifiedGroups = "{lv_cr_resident.ccat_physiq}"
*-- Here , I have Error 1429
*-- OLE IDispatch exception code 0 from Crystal Reports ActiveX Designer:
*-- crSpecified is not set for sortDirection....
*-- But the SpecifiedGroups is Good !
*-- Help Please




Who can help me?

Thank you

Help please